Pharmasset to Present at Cowen and Company 30th Annual Healthcare Conference

PRINCETON, N.J., March 3 Pharmasset, Inc. (Nasdaq: VRUS) announces that management will present at the Cowen and Company 30th Annual Healthcare Conference being held from March 8 to 11, 2010 at the Boston Copley Marriot Place, Boston, MA. Schaefer Price, Pharmasset's President and Chief Executive Officer, will provide an overview of the company at the conference on Monday, March 8, 2010 at 4:45 PM (ET).

To access a simultaneous webcast of Mr. Price's overview via the internet, log on to the "Events & Presentations" section of the Investor Center on Pharmasset's website at https://owa.pharmasset.com/exchweb/bin/redir.asp?URL=http://investor.pharmasset.com/events.cfmhttp://investor.pharmasset.com/events.cfm. Please connect to the website at least ten minutes prior to the start of the presentation to ensure adequate time for a reliable connection and any software download that may be necessary for the webcast.

A replay of the webcast will be available on Pharmasset's website for thirty days following the conference. The investor presentation will be available for download in PDF format immediately following the presentation in the "Events & Presentations" section of the Investor Center on Pharmasset's website at https://owa.pharmasset.com/exchweb/bin/redir.asp?URL=http://investor.pharmasset.com/events.cfmhttp://investor.pharmasset.com/events.cfm.

About Pharmasset

Pharmasset is a clinical-stage pharmaceutical company committed to discovering, developing, and commercializing novel drugs to treat viral infections. Pharmasset's primary focus is on the development of oral therapeutics for the treatment of hepatitis C virus (HCV) and, secondarily, on the development of Racivir (TM) for the treatment of human immunodeficiency virus (HIV). Our research and development efforts focus on nucleoside/tide analogs, a class of compounds which act as alternative substrates for the viral polymerase, thus inhibiting viral replication. We currently have three clinical-stage product candidates. RG7128, a nucleoside analog for chronic HCV infection, is in two Phase 2b clinical trials in combination with Pegasys(R) plus Copegus(R). These clinical studies are being conducted through a strategic collaboration with Roche. Our other clinical stage candidates include PSI-7977, an unpartnered, next- generation HCV nucleotide analog that is in a Phase 2a trial; and Racivir, for the treatment of HIV, which has completed a Phase 2 clinical trial. We also have in our pipeline two purine nucleotide analogs, PSI-938 and PSI-879, in advanced preclinical development.

Pegasys(R) and Copegus(R) are registered trademarks of Roche.

Forward-Looking Statements

Pharmasset "Safe Harbor" Statement under the Private Securities Litigation Reform Act of 1995: Statements in this press release regarding our business that are not historical facts are "forward-looking statements" that involve risks and uncertainties, including, without limitation, the risk that adverse events could cause the cessation or delay of any of the ongoing or planned clinical trials and/or our development of our product candidates, the risk that the results of previously conducted studies involving our product candidates will not be repeated or observed in ongoing or future studies involving our product candidates, the risk that our collaboration with Roche will not continue or will not be successful, and the risk that any one or more of our product candidates will not be successfully developed and commercialized. For a discussion of these and other risks and uncertainties, any of which could cause our actual results to differ from those contained in the forward-looking statements, see the section of our Annual Report on Form 10-K for the fiscal year ended September 30, 2009 and our Quarterly Report on Form 10Q for the period ended December 31, 2009 filed with the Securities and Exchange Commission entitled "Risk Factors" and discussions of potential risks and uncertainties in our subsequent filings with the Securities and Exchange Commission.

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